package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.service.ProductSaveService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.commons.lang3.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam searchParam) {
        //动态构建出查询需要的DSL语句

        SearchResult result=null;
        //准备检索请求
        SearchRequest searchRequest = buildSearchRequrest(searchParam);
        try {
            //执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            //分析响应数据封装成我们需要的格式
            result=buildSearchResult(response,searchParam);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 准备检索请求
     * 模糊匹配，过滤(按照属性，分类，品牌，价格区间，库存)，排序，分页，高亮，聚合分析
     * @return
     */
    private SearchRequest buildSearchRequrest(SearchParam searchParam) {
        //创建检索请求
        SearchRequest searchRequest = new SearchRequest();
        //指定索引
        searchRequest.indices(EsConstant.PRODUCT_INDEX);
        //指定DSL,检索条件(参照resource下的DSL.json构建查询条件)
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //==============模糊匹配，过滤(按照属性，分类，品牌，价格区间，库存)====================

        //构建bool - query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //must-模糊匹配查询
        if (!StringUtils.isEmpty(searchParam.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitel",searchParam.getKeyword()));
        }

        //filter - 按照三级分类id过滤查询
        if (searchParam.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",searchParam.getCatalog3Id()));
        }

        //filter - 按照品牌id过滤查询
        if (searchParam.getBrandId()!=null && searchParam.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",searchParam.getBrandId()));
        }

        //filter - 按照所有指定的属性进行过滤查询
        if (searchParam.getAttrs()!=null && searchParam.getAttrs().size()>0){
            //attrs=1_5寸:8寸&attrs=2_16G:8G
            for (String attrStr : searchParam.getAttrs()) {
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();
                //attrStr=1_5寸:8寸
                String[] s = attrStr.split("_");
                String attrId=s[0];//检索的属性id
                String[] attrValues = s[1].split(":");//这个检索的属性的值
                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                //每一个都必须生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs",nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }

        //filter - 按照是否有库存进行过滤查询
        if (searchParam.getHasStock()!=null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",searchParam.getHasStock()==1));
        }

        //filter - 按照价格区间过滤查询
        if (!StringUtils.isEmpty(searchParam.getSkuPrice())){
            //skuPrice=_500/_500/500_
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] split = searchParam.getSkuPrice().split("_");
            if (split.length==2){
                //区间
                rangeQuery.gte(split[0]).lte(split[1]);
            }else if (split.length==1){
                if (searchParam.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(split[0]);
                }

                if (searchParam.getSkuPrice().endsWith("_")){
                    rangeQuery.lte(split[0]);
                }

            }
            boolQuery.filter(rangeQuery);
        }
        //把所有的boolQuery构建好的语句进行查询
        sourceBuilder.query(boolQuery);

        //=================排序，分页，高亮，======================
        //排序
        if (!StringUtils.isEmpty(searchParam.getSort())){
            //sort=saleCount_asc/desc
            //sort=skuPrice_asc/desc
            //sort=hotScore_asc/desc
            String sort = searchParam.getSort();
            String[] split = sort.split("_");
            SortOrder order=split[1].equalsIgnoreCase("asc")? SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(split[0],order);
        }

        //分页
        sourceBuilder.from((searchParam.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //高亮
        if (!StringUtils.isEmpty(searchParam.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitel");
            builder.preTags("<b style='color=red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        //===============聚合分析==================
        //TODO 品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //TODO 分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg");
        catalog_agg.field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //TODO 属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId").size(10);
        //聚合出当前attrId对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //聚合出当前attrId对应的属性值
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(10));
        attr_agg.subAggregation(attr_id_agg);

        sourceBuilder.aggregation(attr_agg);
        searchRequest.source(sourceBuilder);

        System.out.println("构建的DSL:"+ sourceBuilder.toString());
        return searchRequest;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam searchParam) {
        SearchResult result = new SearchResult();
        //返回所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels=new ArrayList<>();
        if (hits.getHits()!=null && hits.getHits().length>0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                //获取需要高亮显示
                if (!StringUtils.isEmpty(searchParam.getKeyword())){
                    HighlightField skuTitel = hit.getHighlightFields().get("skuTitel");
                    String string = skuTitel.getFragments()[0].string();
                    esModel.setSkuTitel(string);
                }

                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);

        //============从聚合信息中获取================
        //所有的聚合信息
        Aggregations aggregations = response.getAggregations();
        if (aggregations!=null){
            //当前所有商品涉及到的所有属性信息
            List<SearchResult.AttrVo> attrVos=new ArrayList<>();

            ParsedNested attr_agg = aggregations.get("attr_agg");
            ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");//子聚合中
            if (attr_id_agg.getBuckets()!=null && attr_id_agg.getBuckets().size()>0){
                for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
                    SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
                    //属性的id
                    attrVo.setAttrId(bucket.getKeyAsNumber().longValue());
                    //属性的名字
                    String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();//一个属性id对应一个属性名
                    attrVo.setAttrName(attrName);
                    //属性的所有值
                    List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                        String keyAsString = ((Terms.Bucket) item).getKeyAsString();

                        return keyAsString;
                    }).collect(Collectors.toList());
                    attrVo.setAttrValue(attrValues);

                    attrVos.add(attrVo);
                }
            }
            result.setAttrs(attrVos);

            //当前所有商品涉及到的所有品牌信息
            List<SearchResult.BrandVo> brandVos=new ArrayList<>();

            ParsedLongTerms brand_agg = aggregations.get("brand_agg");
            if (brand_agg.getBuckets()!=null && brand_agg.getBuckets().size()>0){
                for (Terms.Bucket bucket : brand_agg.getBuckets()) {
                    SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
                    //品牌的id
                    brandVo.setBrandId(Long.parseLong(bucket.getKeyAsString()));
                    //品牌的名字
                    ParsedStringTerms brand_name_agg = bucket.getAggregations().get("brand_name_agg");//名字和图片在子聚合中
                    String brand_name = brand_name_agg.getBuckets().get(0).getKeyAsString();//一个品牌的id对应一个名字
                    brandVo.setBrandName(brand_name);
                    //品牌的图片
                    String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();//一个品牌的id对应一个图片
                    brandVo.setBrandImg(brandImg);

                    brandVos.add(brandVo);
                }
            }
            result.setBrands(brandVos);
            //当前所有商品涉及到的所有分类信息
            List<SearchResult.CatalogVo> catalogVos=new ArrayList<>();

            ParsedLongTerms catalog_agg = aggregations.get("catalog_agg");
            List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
            if (buckets!=null && buckets.size()>0){
                for (Terms.Bucket bucket : buckets) {
                    SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
                    //分类Id
                    catalogVo.setCatalogId(Long.parseLong(bucket.getKeyAsString()));
                    //分类的名字
                    ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");//名字在子聚合中
                    String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();//一个分类id对应一个名字
                    catalogVo.setCatalogName(catalog_name);

                    catalogVos.add(catalogVo);
                }
            }
            result.setCatalogs(catalogVos);
        }


        //============从聚合信息中获取================

        //分页信息-页码
        result.setPageNum(searchParam.getPageNum());
        //分页信息-总记录数
        long total = hits.getTotalHits();
        result.setTotal(total);
        //总页码
        int totalPages= (int) (total%EsConstant.PRODUCT_PAGESIZE==0?total/EsConstant.PRODUCT_PAGESIZE:(total/EsConstant.PRODUCT_PAGESIZE+1));
        result.setTotalPages(totalPages);
        //所有的页码
        List<Integer> pageNavs=new ArrayList<>();
        for (int i=1;i<=totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //构建面包屑导航功能
        if (searchParam.getAttrs()!=null && searchParam.getAttrs().size()>0){
            List<SearchResult.NavVO> collect = searchParam.getAttrs().stream().map(attr -> {
                SearchResult.NavVO navVO = new SearchResult.NavVO();
                //attrs=2_5寸:6寸
                String[] split = attr.split("_");
                navVO.setNavValue(split[1]);

                result.getAttrIds().add(Long.parseLong(split[0]));//包屑导有的属性，则条件不显示

                R r = productFeignService.getArrtsInfo(Long.parseLong(split[0]));
                if (r.getCode()==0){
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVO.setNavName(data.getAttrName());
                }else {
                    navVO.setNavName(split[0]);
                }

                //取消这个面包屑以后，我们要跳转的路径，将请求地址的url里面当前置空
                //拿到所有的条件，去掉当前
                //attrs=1_5寸:8寸&attrs=2_16G:8G
                String replace = replaceQueryString(searchParam, attr,"attrs");
                navVO.setLink("http://search.gulimall.com/list.htm?"+replace);

                return navVO;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }

        //品牌
        if (searchParam.getBrandId()!=null && searchParam.getBrandId().size()>0){
            List<SearchResult.NavVO> navs = result.getNavs();
            SearchResult.NavVO navVO = new SearchResult.NavVO();

            navVO.setNavName("品牌");
            //TODO 远程查询所有品牌
            R r = productFeignService.brandsInfo(searchParam.getBrandId());
            if (r.getCode()==0){
                List<BrandVo> data = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace="";
                for (BrandVo datum : data) {
                    buffer.append(datum.getBrandName()+";");
                    replace = replaceQueryString(searchParam, datum.getBrandId()+"","brandId");
                }
                navVO.setNavValue(buffer.toString());
                navVO.setLink("http://search.gulimall.com/list.htm?"+replace);
            }

            navs.add(navVO);
        }

        //分类:不需要导航取消

        return result;
    }

    private String replaceQueryString(SearchParam searchParam, String value,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode=encode.replace("+","%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return searchParam.get_quertString().replace("&"+key+"=" + encode, "");
    }
}
